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[Chrysalis]

Well les, after I resynced my 8800nl yesterday its got a sync about 1.5mbit higher than the hg612 would be expected to get I think 0.5 is due to the change to the MK1 so lets call it 1mbit and the ES is still much more respectable than the zyxel.

[les-70]

  Interesting. I wonder whether it is hardware or dsl driver changes that make these differences.  Both I guess. Are you on the 038 or 039 firmware?  The 038 did not give me quite as big a sync increase but did give better errors than the 039.

[Chrysalis]

remember the billion has 39g and zyxel 39i.

my billion is still on the shipped firmware which has 39g.

[les-70]

If you change to 038 you will most probably get even less errors. especially CRC and SES.  The 038 firmware is just the same apart from the dsl driver.

[Chrysalis]

I am happy with my current ES count tho, 39i was I think a bit too high but 39g seems fine for my line.

[roseway]

After 25 days of uptime with no alarms, my 8800NL locked up yesterday evening. I could continue using the internet normally, but both the GUI and the telnet interfaces became totally unresponsive. I noticed what had happened after about an hour and rebooted the 8800NL, and it returned to normal operation with the same performance as before the event.

The firmware is the latest from Billion, version 2.32d.dh14. I don't know if this was a one-off glitch - the device doesn't overheat, and there were no warning signs in the stats. So I'm not going to do anything about it, just wait and see.

[adslmax]

My Billion 8800NL uptime now 10 days. Can still access GUI and telnet interfaces. 

[olwalh]

I installed my Billion 8800NL last night and it has not gone as well as I would like, the rate has been dropping.

Below are my stats, is there anything of concern? I down graded this morning to version 2.32d.dm2

Should I revert to an Openreach Modem, I have both the ECI and the HG612

adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    0
Last initialization procedure status:   0
Max:    Upstream rate = 25159 Kbps, Downstream rate = 72608 Kbps
Bearer: 0, Upstream rate = 19999 Kbps, Downstream rate = 73298 Kbps

Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        6.1             15.1
Attn(dB):        0.0             0.0
Pwr(dBm):        12.5            6.6

                        VDSL2 framing
                        Bearer 0
MSGc:           18              26
B:              239             237
M:              1               1
T:              22              42
R:              0               16
S:              0.1042          0.3781
L:              18424           5374
D:              1               1
I:              240             127
N:              240             254

                        Counters
                        Bearer 0
OHF:            5388094         2343565
OHFErr:         107             11
RS:             0               3896951
RSCorr:         0               48
RSUnCorr:       0               0

                        Bearer 0
HEC:            222             0
OCD:            1               0
LCD:            1               0
Total Cells:    1311047388              0
Data Cells:     955863          0
Drop Cells:     0
Bit Errors:     0               0

ES:             27              7
SES:            0               0
UAS:            26              26
AS:             9303

                        Bearer 0
INP:            0.00            0.00
INPRein:        0.00            0.00
delay:          0               0
PER:            1.72            3.98
OR:             111.22          64.22
AgR:            73409.24        20063.54

Bitswap:        909/909         9/9

Total time = 2 hours 35 min 29 sec
FEC:            0               48
CRC:            107             11
ES:             27              7
SES:            0               0
UAS:            26              26
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 15 minutes time = 5 min 29 sec
FEC:            0               0
CRC:            14              0
ES:             2               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            0               7
CRC:            3               5
ES:             3               1
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Latest 1 day time = 2 hours 35 min 29 sec
FEC:            0               48
CRC:            107             11
ES:             27              7
SES:            0               0
UAS:            26              26
LOS:            0               0
LOF:            0               0
LOM:            0               0
Previous 1 day time = 0 sec
FEC:            0               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
Since Link time = 2 hours 35 min 1 sec
FEC:            0               48
CRC:            107             11
ES:             27              7
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
LOM:            0               0
 >

[roseway]

There's nothing strange in those stats, and it's hard to tell if changing to a different modem would improve the result. Perhaps the falling speed is the result of crosstalk.

[olwalh]

There's nothing strange in those stats, and it's hard to tell if changing to a different modem would improve the result. Perhaps the falling speed is the result of crosstalk.

Thanks

I is difficult without a reference source it is the high number of ES that concerns me


Mode VDSL2
Traffic Type PTM
Status Up
Link Power State L0
 
 Downstream Upstream
Line Coding (Trellis) On On
SNR Margin (dB) 6.1 15.1
Attenuation (dB) 0.0 0.0
Output Power (dBm) 12.5 6.6
Attainable Rate (Kbps) 72608 25187
 
Rate (Kbps) 73298 19999
 
B (# of bytes in Mux Data Frame) 239 237
M (# of Mux Data Frames in an RS codeword) 1 1
T (# of Mux Data Frames in an OH sub-frame) 22 42
R (# of redundancy bytes in the RS codeword) 0 16
S (# of data symbols over which the RS code word spans) 0.1042 0.3781
L (# of bits transmitted in each data symbol) 18424 5374
D (interleaver depth) 1 1
I (interleaver block size in bytes) 240 127
N (RS codeword size) 240 254
Delay (msec) 0 0
INP (DMT symbol) 0.00 0.00
 
OH Frames 0 0
OH Frame Errors 131 12
RS Words 0 24423
RS Correctable Errors 0 58
RS Uncorrectable Errors 0 0
 
HEC Errors 277 0
OCD Errors 1 0
LCD Errors 1 0
Total Cells 1774234428 0
Data Cells 10521159 0
Bit Errors 0 0
 
Total ES 46 8
Total SES 0 0
Total UAS 26 26
     

[roseway]

The total number of ES doesn't mean anything without a time frame, but from your previous posting you had 27 downstream ES in 2 hours 35 minutes, which is about 10.5 per hour. This isn't enough to be of any direct concern, unless the rate increases later.

[MartinGoose]

The total number of ES doesn't mean anything without a time frame, but from your previous posting you had 27 downstream ES in 2 hours 35 minutes, which is about 10.5 per hour. This isn't enough to be of any direct concern, unless the rate increases later.

Do you have a 'rule of thumb' as to how many would be a concern?

[les-70]

  Roseway may/probably-will  know more but connections with an average of about 30/hour or less and odd peaks at ~60/hour seem to stay on fast path.  Some say it can be as high as 60 or 120 /hour.

  I would be cautious if the average is over 30/hour and concerned if is it over 60/hour. 

[Ixel]

If Zen's documentation on FTTC DLM is actually correct, they state:
- Speed Profile: A connection should drop no more than 20 times in a 24 hour period, and should error no more than 2 times per minute.
- Standard Profile: Allowing no more than 10 drops in a 24 hour period and no more than 1 error every minute.
- Stable Profile: Allowing no more than 5 drops in a 24 hour period and no more than 1 error every 2 minutes.

Source: http://support.zen.co.uk/kb/Knowledgebase/Fibre-Optic-Broadband-FTTC-What-is-DLM-and-how-does-it-work

So far I believe I breached the 20 re-syncs threshold, or at least came very close to it yesterday due to the buggy firmware on my ASUS, and this caused a speed banding from 74/20 to 49/15 (dropped by two bands?). No error correction (e.g. INP, delay) was applied however, which makes me wonder if DLM only applies error correction if the MTBE threshold is breached, which based on my regular observations yesterday I would say it wasn't breached (MTBE).

[adslmax]

I was very surprise as BT Wholesale had updated FTTC 80/20 last february 2014 and now today addition FTTPoD 330/30 (available now)